I am interested in each micronutrient, however to add more to the boron conversation:

The attached paper states they trialed boron foliar sprays with boric acid of 0%, 0.0625%, 0.125% and 0.1875% of total solution, and the .0625% application worked best. Boric acid is 18% boron. So .0625% x 18% = 112.5ppm. Begs the question, if they tested a foliar between 0 and 112ppm, like 10ppm, would it perform even better?